'\" te
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.TH YPPASSWD 1 "Feb 25, 2017"
.SH NAME
yppasswd \- change your network password in the NIS database
.SH SYNOPSIS
.LP
.nf
\fByppasswd\fR [\fIusername\fR]
.fi

.SH DESCRIPTION
.LP
The \fByppasswd\fR utility changes the network password  associated with the
user \fIusername\fR in the Network Information Service (\fBNIS\fR) database. If
the user has done a \fBkeylogin\fR(1), and a publickey/secretkey pair exists
for the user in the \fBNIS\fR \fBpublickey.byname\fR map, \fByppasswd\fR also
re-encrypts the secretkey with the new password. The \fBNIS\fR password may be
different from the local one on your own machine.
.sp
.LP
\fByppasswd\fR prompts for the old  \fBNIS\fR password, and then for the new
one. You must type in the old password correctly for the change to take effect.
The new password must be typed twice, to forestall mistakes.
.sp
.LP
New passwords must be at least four characters long, if they use a sufficiently
rich alphabet, and at least six characters long if monocase. These rules are
relaxed if you are insistent enough. Only the owner of the name or the
super-user may change a password; superuser on the root master will not be
prompted for the old password, and does not need to follow password
construction requirements.
.sp
.LP
The \fBNIS\fR password daemon, \fBrpc.yppasswdd\fR must be running on your
\fBNIS\fR server in order for the new password to take effect.
.SH SEE ALSO
.LP
.BR keylogin (1),
.BR login (1),
.BR passwd (1),
.BR getpwnam (3C),
.BR getspnam (3C),
.BR secure_rpc (3NSL),
.BR nsswitch.conf (5),
.BR attributes (7)
.SH WARNINGS
.LP
Even after the user has successfully changed his or her password using this
command, the subsequent \fBlogin\fR(1) using the new password will be
successful only if the user's password and shadow information is obtained from
NIS. See \fBgetpwnam\fR(3C), \fBgetspnam\fR(3C), and \fBnsswitch.conf\fR(5).
.SH NOTES
.LP
The use of \fByppasswd\fR is discouraged, as it is now only a wrapper around
the \fBpasswd\fR(1) command, which should be used instead. Using
\fBpasswd\fR(1) with the \fB-r\fR \fBnis\fR option will
achieve the same results, and will be consistent across all the different name
services available.
.SH BUGS
.LP
The update protocol passes all the information to the server in one \fBRPC\fR
call, without ever looking at it. Thus, if you type your old password
incorrectly, you will not be notified until after you have entered your new
password.
